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741 Marine Drive PHONE <br />y, Bellingham, WA98225 360733_7318 <br />,r ,�r�._,�+R ! 20611 on, Avenue 3 88TOLL 51 FAX <br />�+ '[+rl►1' (�++i��"r/! Arlington, WA 98223 888 FREE <br />5276 360 733 7418 <br />February 26, 2018 <br />Job No. 17-0803 <br />Harmsen & Associates, Inc. <br />840 SE 8t' Avenue #102 <br />Oak Harbor, Washington 98277 <br />Attn: Mr. David Harmsen <br />Re: UltraBlock® Retaining Wall Design for <br />Mukilteo School District <br />9001 Airport Road <br />Everett, Washington 98204 <br />Dear Mr. Harmsen: <br />Permit#: PW1902-019 <br />Site Address: 8925 AIRPORT RD <br />Owner: MUKILTEO SCHOOL DIST 6 <br />Tenant: [TenNamej <br />App. Date: 2/14/7-019 <br />Proposed Use: <br />Description: SITE WORK -TRANSPORTATION FACILITIES <br />Reviewed By: Qate: I Z019 <br />Office Set Jcb Site Set Fire/Planning Set <br />As requested, GeoTest Services, Inc. is pleased to submit an UltraBlocko retaining wall <br />design report for the proposed bus yard expansion located at the above referenced <br />address. The approximate location of the project site can be seen on the Vicinity Map, <br />Figure 1. This report summarizes our design and recommendations for installation of a <br />gravity retaining wall system on the property. <br />Project Description <br />As currently envisioned, the proposed retaining wall will be constructed utilizing the <br />UltraBlock® modular block wall system. The proposed retaining wall will be used to <br />create space for an additional bus parking/drive area located at the southeast corner of <br />the property. The location of the wall can be seen on the Site Plan, Figure 2. We <br />understand that this gravity retaining wall will experience relatively heavy traffic <br />surcharge due to school buses. <br />The planned retaining wall will extend along a wetlands improvement area south of the <br />property. Above the retaining wall will be relatively flat parking surface and drive path. <br />The top of fill elevation for the wall will be approximately the same elevation as the <br />existing parking lot. The retaining wall is designed to have a maximum exposed wall <br />height of 6 feet (not including a 1.25 foot UltraBlockO Cap). <br />General Geologic Conditions <br />Geologic information for the project site was obtained from the interactive Geologic Map <br />of Washington State, published by the Washington State Department of Natural <br />Resources (DNR). According to the referenced map, near surface soils mapped on the <br />project area consist of Vashon Stade Glacial Till (Qvt). Vashon stade glacial till generally <br />consists of highly compacted, poorly sorted and unstratified mix of clay, silt, sand, <br />gravel, cobbles and boulders deposited by glacial ice. <br />The subsurface soils encountered in our explorations were int �t� <br />representative of the mapped Vashon Stade Glacial Till deposits. <br />OCT 1 6 2DIS U1 <br />Page 1 of 8 <br />CITY OF EVERETT <br />